import * as React from 'react';
import * as RechartsPrimitive from 'recharts';

import { cn } from '@/utils/utils';

// Format: { THEME_NAME: CSS_SELECTOR }
const THEMES = { light: '', dark: '.dark' } as const;

export type ChartConfig = Record<
    string,
    {
        label?: React.ReactNode;
        icon?: React.ComponentType;
    } & ({ color?: string; theme?: never } | { color?: never; theme: Record<keyof typeof THEMES, string> })
>;

interface ChartContextProps {
    config: ChartConfig;
}

const ChartContext = React.createContext<ChartContextProps | null>(null);

function useChart() {
    const context = React.useContext(ChartContext);

    if (!context) {
        throw new Error('useChart must be used within a <ChartContainer />');
    }

    return context;
}

function ChartContainer({
    id,
    className,
    children,
    config,
    ...props
}: React.ComponentProps<'div'> & {
    config: ChartConfig;
    children: React.ComponentProps<typeof RechartsPrimitive.ResponsiveContainer>['children'];
}) {
    const uniqueId = React.useId();
    const chartId = `chart-${id || uniqueId.replace(/:/g, '')}`;

    return (
        <ChartContext.Provider value={{ config }}>
            <div
                data-slot="chart"
                data-chart={chartId}
                className={cn(
                    "[&_.recharts-cartesian-axis-tick_text]:fill-text-disabled [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-bg-subtle [&_.recharts-reference-line_[stroke='#ccc']]:stroke-border flex aspect-video justify-center text-xs [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-hidden [&_.recharts-sector]:outline-hidden [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-surface]:outline-hidden",
                    className
                )}
                {...props}
            >
                <ChartStyle id={chartId} config={config} />
                <RechartsPrimitive.ResponsiveContainer>{children}</RechartsPrimitive.ResponsiveContainer>
            </div>
        </ChartContext.Provider>
    );
}

const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
    const colorConfig = Object.entries(config).filter(([, config]) => config.theme || config.color);

    if (!colorConfig.length) {
        return null;
    }

    return (
        <style
            dangerouslySetInnerHTML={{
                __html: Object.entries(THEMES)
                    .map(
                        ([theme, prefix]) => `
${prefix} [data-chart=${id}] {
${colorConfig
    .map(([key, itemConfig]) => {
        const color = itemConfig.theme?.[theme as keyof typeof itemConfig.theme] || itemConfig.color;
        return color ? `  --color-${key}: ${color};` : null;
    })
    .join('')}
}
`
                    )
                    .join('')
            }}
        />
    );
};

const ChartTooltip = RechartsPrimitive.Tooltip;

function ChartTooltipContent({
    active,
    payload,
    className,
    indicator = 'dot',
    hideLabel = false,
    hideIndicator = false,
    label,
    labelFormatter,
    labelClassName,
    formatter,
    color,
    nameKey,
    labelKey
}: React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
    React.ComponentProps<'div'> & {
        hideLabel?: boolean;
        hideIndicator?: boolean;
        indicator?: 'line' | 'dot' | 'dashed';
        nameKey?: string;
        labelKey?: string;
    }) {
    const { config } = useChart();

    const tooltipLabel = React.useMemo(() => {
        if (hideLabel || !payload?.length) {
            return null;
        }

        const [item] = payload;
        const key = `${labelKey || item?.dataKey || item?.name || 'value'}`;
        const itemConfig = getPayloadConfigFromPayload(config, item, key);
        const value = !labelKey && typeof label === 'string' ? config[label]?.label || label : itemConfig?.label;

        if (labelFormatter) {
            return <div className={cn('text-text-body-medium-medium text-text-primary', labelClassName)}>{labelFormatter(value, payload)}</div>;
        }

        if (!value) {
            return null;
        }

        return <div className={cn('text-text-body-medium-medium text-text-primary', labelClassName)}>{value}</div>;
    }, [label, labelFormatter, payload, hideLabel, labelClassName, config, labelKey]);

    if (!active || !payload?.length) {
        return null;
    }

    const nestLabel = payload.length === 1 && indicator !== 'dot';

    return (
        <div className={cn('bg-bg-subtle grid min-w-[8rem] items-start gap-1.5 rounded p-2 text-xs shadow-xl', className)}>
            {!nestLabel ? tooltipLabel : null}
            <div className="grid gap-1.5">
                {payload
                    .filter((item) => item.type !== 'none')
                    .map((item, index) => {
                        const key = `${nameKey || item.name || item.dataKey || 'value'}`;
                        const itemConfig = getPayloadConfigFromPayload(config, item, key);
                        const indicatorColor = color || item.payload.fill || item.color;

                        return (
                            <div
                                key={item.dataKey}
                                className={cn(
                                    '[&>svg]:text-text-secondary flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5',
                                    indicator === 'dot' && 'items-center'
                                )}
                            >
                                {formatter && item?.value !== undefined && item.name ? (
                                    formatter(item.value, item.name, item, index, item.payload)
                                ) : (
                                    <>
                                        {itemConfig?.icon ? (
                                            <itemConfig.icon />
                                        ) : (
                                            !hideIndicator && (
                                                <div
                                                    className={cn('shrink-0 rounded-[2px] border-(--color-border) bg-(--color-bg)', {
                                                        'h-2.5 w-2.5': indicator === 'dot',
                                                        'w-1': indicator === 'line',
                                                        'w-0 border-[1.5px] border-dashed bg-transparent': indicator === 'dashed',
                                                        'my-0.5': nestLabel && indicator === 'dashed'
                                                    })}
                                                    style={
                                                        {
                                                            '--color-bg': indicatorColor,
                                                            '--color-border': indicatorColor
                                                        } as React.CSSProperties
                                                    }
                                                />
                                            )
                                        )}
                                        <div className={cn('flex flex-1 justify-between leading-none', nestLabel ? 'items-end' : 'items-center')}>
                                            <div className="grid gap-1.5">
                                                {nestLabel ? tooltipLabel : null}
                                                <span className="text-text-secondary">{itemConfig?.label || item.name}</span>
                                            </div>
                                            {item.value !== undefined && (
                                                <span className="text-text-primary font-mono font-medium tabular-nums">{item.value.toLocaleString()}</span>
                                            )}
                                        </div>
                                    </>
                                )}
                            </div>
                        );
                    })}
            </div>
        </div>
    );
}

const ChartLegend = RechartsPrimitive.Legend;

function ChartLegendContent({
    className,
    hideIcon = false,
    payload,
    verticalAlign = 'bottom',
    nameKey
}: React.ComponentProps<'div'> &
    Pick<RechartsPrimitive.LegendProps, 'payload' | 'verticalAlign'> & {
        hideIcon?: boolean;
        nameKey?: string;
    }) {
    const { config } = useChart();

    if (!payload?.length) {
        return null;
    }

    return (
        <div className={cn('flex items-center justify-center gap-4', verticalAlign === 'top' ? 'pb-3' : 'pt-3', className)}>
            {payload
                .filter((item) => item.type !== 'none')
                .map((item) => {
                    const key = nameKey || item.dataKey?.toString() || 'value';
                    const itemConfig = getPayloadConfigFromPayload(config, item, key);

                    return (
                        <div
                            key={item.value}
                            className={cn('[&>svg]:text-neutral-500 flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3 dark:[&>svg]:text-neutral-400')}
                        >
                            {itemConfig?.icon && !hideIcon ? (
                                <itemConfig.icon />
                            ) : (
                                <div
                                    className="h-2 w-2 shrink-0 rounded-[2px]"
                                    style={{
                                        backgroundColor: item.color
                                    }}
                                />
                            )}
                            {itemConfig?.label}
                        </div>
                    );
                })}
        </div>
    );
}

// Helper to extract item config from a payload.
function getPayloadConfigFromPayload(config: ChartConfig, payload: unknown, key: string) {
    if (typeof payload !== 'object' || payload === null) {
        return undefined;
    }

    const payloadPayload = 'payload' in payload && typeof payload.payload === 'object' && payload.payload !== null ? payload.payload : undefined;

    let configLabelKey: string = key;

    if (key in payload && typeof payload[key as keyof typeof payload] === 'string') {
        configLabelKey = payload[key as keyof typeof payload] as string;
    } else if (payloadPayload && key in payloadPayload && typeof payloadPayload[key as keyof typeof payloadPayload] === 'string') {
        configLabelKey = payloadPayload[key as keyof typeof payloadPayload] as string;
    }

    return configLabelKey in config ? config[configLabelKey] : config[key];
}

export { ChartContainer, ChartLegend, ChartLegendContent, ChartStyle, ChartTooltip, ChartTooltipContent };
